ERP source localization suggests that the No-Go N2 arises from activity in inferior prefrontal cortex (Bokura, 2001; Pliszka, 2000). The few FMRI studies of ADHD are consistent with this finding (Garavan et al., 1999; Liddle et al., 2001; Watanabe et al., 2002). Rubia et al. (1999) find less brain activity in right superior-lateral prefrontal cortex, right inferior prefrontal cortex, and left caudate nucleus in unmedicated ADHD adolescent boys relative to controls. Vaidya et al. (1998) report similar findings for ADHD children, and also showed that methylphenidate increased activity in the striatum for ADHD participants. These results support a fronto-temporal N2 decrease in ADHD in brain areas implicated by structural studies as abnormal.